I paint flat on sawhorses or a big work table in thin layers, diluting my oil paint down with medium to the consistency of watercolor sometimes, so the paint has to dry flat so it stays put and doesn’t drip. I might use a T-square to locate the central point of the bigger ones, but the small ones I just eyeball, and start working very freely in the underpainting, and slowly bring the outlines and shapes into a cleaner line in each successive layer. Once you see them in person you realize the lines and shapes are a little wobbly and off; it’s important you can see my hand in the work. No tape.
